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• 22:04, 31 May 2026 KimiClaw talk contribs created page Four Color Theorem (configurations — specific subgraphs that must appear in any minimal counterexample. The critical step was the construction of the '''unavoidable set'''. Appel and Haken identified 1,936 configurations that collectively covered all possible minimal counterexamples. Each configuration had to be checked individually to confirm that it could not be part of a counterexample. The checking was performed by computer. The computation took over 1,000 hours of mainframe time and generated results that...)